Safety device for punch presses and the like



Jan. 30, 1923.

I 9 SHEETS'SHEET 1 H SCHOENDELEN. SAFETY DEVICE FOR PUNCH PRESSES AND THE LIKE.

Fl LED MAY 29. 1920.

Jan. 30, 1923. 1,443,761

H. SCHOENDELEN.

SAFETY DEVlCE FOR PUNCH PREssEs AND THE LIKE.

FILED MAY 29 1920. 9 SHEETS'SHEET 2 Jan. 30, 1923.

. H. SCHOENDELEN. SAFETY DEVICE FOR PUNCH PRESSES AND THE LIKE.

9 SHEETS'SHEET 3 F1 LED MAY 29 .920

. H. SCHOENDE SAFETY DEvlcE FOR PUNCH R FILED MAY 29 Jan. 30, 1923.

LEN

P EssEs AND THE LIKE H. SCHOENDELEN. SAFETY DEVICE FOR PUNCH PREssEs AND THE LIKE.

FILED MAY 29, 1920 9 SHEETS'SHEET 5 Jan. 30, 1923. 1,443,761

Jan. 30, 1923.

9 SHEETS-SHEET 6 Jan. 30, 1923.

H. SCHOENDELEN. I SAFETY DEVI CE FOR PUNCH PRESSES AND THE LIKE.

9 SHEETS-SHEET 7 Fl LED MAY 29 l 920.

Jan. 30, 1923. I 1,443,761

H. SCHDENDELEN.

SAFETY DEVICE FOR PUNCH PRESSES AND THE LIKE. Fl LED MAY 29. 1920 9 SHEETS'SHEET 8 Jan. 30, 1923.

H. ENDELEN.

SAFETY DEVICE FOR UNCH PRESSES AND THE LIKE.

FILED MAY 29. I920.

%\/HFLII Patente Jan. 3. 1923 HUGO SCHOENDELEN, F HAYWOOD, ILLINOIS, ASSIGNOP, T0

narcnn can SAFETY DEVICE FOR PUNCH DRESSES AND THE LIKE.

Application filed May 29,

To all whom it may concern:

Be it known that I, Huco Sononnnnnnn. a citizen of the United States, residin in Maywood, in the county of Cook and btate ,5 of Illinois, have invented a new and useful Improvement in Safety Devices for Punch Presses and the like, of which the following is a specification.

This invention relates in general to feeding mechanism for punch presses and the like and has more particular reference to feedin mechanisms wherein a strip of sheet metal is fed into a punch press to have a number of articles formed therefrom by successive action of the die parts. It will, however, be manifest that with slight changes the invention may be used for feeding sheet metal to other forms ofpunch presses and to other types of machinery.

A principal object of the present inven tion is the provision of a feeding mecha= nism which may be provided in connection with a punch press to permit the punch press to act continuously and at a high rate of speed, arranging an article at each reciprocation of the active die.

Another object of the invention is the provision of means in such feeding mechanism for safe-guarding against possible introduo tion of more than a single strip into the active. 'zone of the apparatus and to guard against introduction of sheet metal deformed or bent from usable shape. I

The invention contemplates the provision 85 of feed mechanism which will automatically lift the blanks singly from the stack ex-' actly as they are required and deliver them automatically beneath the dies, the parts being so constructed aiiiiarrangedj that the" strips may follow each other in such close sequence as to present a new strlp for die action immediately following the completion of the articles from. the next preceding strip.

better understood from the following description, which taken in connection with the cs? 11' prev H thereof, viewlng Fig. 1.

drawings disclos accompanyin fer-red embodiment thereof.

On the drawing: Figure 1 is. an end elevation of an. apparatus embodying my present invention;

F ig. 2 is a top plan view thereof:

, Numerous other objects and advai mages, of the invention will beapparent as it is 1820. Serial No. 385,203.

. Fig. 3 is a perspective view of the lefthand portion of the feed apparatus looking from the front;

Fig. 4 is a perspective view of the righthand portion thereof and showingthe punching apparatus;

Fig. 5 is a perspective view similar to Fig. 3 and showing the parts in. difierent relation;

Fig. 6 number of the safety devices provided;

Fig. 7 is a plan detail of certain other safety devices;

Fig. 8 is a section taken substantially on the line 8-8 of Fig. 6;

Fig. 9 isa vertical section through a por-' tion of the apparatus as will be presently described; Fig. 10 is an enlarged detail section of a pneumatic lifting device; Fig. 11 is a side elevation thereof. Fig. 12 is a perspective view of the feed bar; and

Fig. 13 is an feed fin er.

For t e purpose of illustrating 'my invention I have shown on the drawing a punch press for punching a number ofcau ends from a stri of material, the punch is a partial plan view showing a enlarged perspective of a i press apparatus including mechanism for advancing astrip from feeding position step by step to present successive portions of it to the operative parts of the press. This press, it. IS believed, need not. be described completely in detail since the present invention relates to means .for arranging l4, carrying the usual die press mechanisms which are driven from a pulley 15 upon the uslial'driving shaft. The feeding" mecha nism for'successively arranging blanks into.

position for 'advancin beneath the die through the usual blan advancing means thesheet in such feeding position together i is disclosed as forming a part of this die press and is arranged at the left-hand side The holder 16 for a stack of blanks is secured upon the bed and extends out to the left, and comprises a bottom 17, a front into the slot; means insuring stoppage of the machine should cluded for preventing the further feeding of the apparatus should the blanks be bent from the fiat form permitting them to enter are also provided for more than a single blank enter the slot and also means for stopping of themachine upon any jamming of the parts or other improper action. Means for lifting the blanks sin ly from the side of the stack adjacent the s ot will first be described.

Three arms, indicated respectively by reference characters 25, 26 and 27, extend up from the support 28 for the stack holder and form bearings for axially reciprocating rods 31, 32 and 33 engaged at their rear ends to a cross bar 34 causing them to move in unison. This cross bar is connected to a slotted link 35, the slot 36 of which embraces'a pin 37 upon a lever 38 pivoted at 39 on the body 14 of the press frame. The lever 38v is in turn eccentrically connected by a link 41 to a disk 42 on the stub shaft 43 having bearing in the body 14. This disk is provided with gear teeth 44 meshing with the gear 45 fixed on a stub shaft 46, which stub shaft is also provided with a gear 47 engaging a gear 48 on the main shaft 49 of the press so that rotation of the main shaft produces eriodic reciprocation of the rods 31 to 33. he ratio of gearing is such that this reciprocation occurs but once for a number of revolutions of the mainshaft equal to the number of stampings to be made from each blank.

Each rod 31 to 33 carries at its forward end a suction head 51 adapted to be brought by the reciprocation of the forward rod into contactwith the adjacent blank of the stack. The rods 31 to .33, and cross connecting rod 34 are hollow or of pipe'form and are con:

nected together by couplings 52 so that communication may be established between the interior of the suction heads 51 and an air exhausting or vacuum'conduit 53'. The form of the rods in the suction head, together with the vacuum creating devices, is perhaps best shown in Figs. 10 and 11. As indicated in Fig. 10 the rod or pipe 34 extendsthrough the coupling 52 of the pipe 33 and is provided with an opening 54 communicating with the interior of a valve chamber 55 hav ing an inlet 56 from the conduit 53. Within this chamber is a valve 57 upon the end of a valve stem 58 extending'down t rough a closure 59 for the valve chamber and through abearing bracket 61 fast on the top of the adjacent head 51. The lower end of this valve stem is fixed to an arm 62 in which is rigidly positioned a pin 63 having hearing at 64 in the arm 61 extending out from the head. When the rodsare moved into contact with the adjacent blank of the stack the pin 61 engages this blank and is pushed upwardly (viewing Fig. 10) lifting the valve and the suction device drawing the air through the three heads creates a holding suction for the blank when the heads are in contact with it. This arrangement provides for the utilization of the suction or vacuum creatingmeans only when a blank is to be lifted and it will be apparent that should the blank be bent or twisted to a degree that will prevent it entering the slot in which it'is to be subsequently placed the suction will be broken at one or the other of the three heads and these heads, being in communication with each other. all fail to have sustaining power for the blank so that it is not picked up and brought into accurate arrangement with the slot.

. When, however, a blank ofproper form is available it is carried by the suction heads on their return movement until it is accurately in registration with the slot 24, means being provided for moving it edgewise into the slot. These means comprise two pushers 65 mounted upon the ends of rods 66 that are adapted toreciprocate in bearings 67. The rear or lower ends of the rods 66 are connected by links 68 with arms 69 fast on the cross shaft 71 pivotally mounted in bearing arms 72 extending out at the back of the support 28. The shaft 71 has an arm 73 connected by a link 74 with an arm 75 of a bell crank lever pivoted upon the stub shaft 39, the other arm 76 of which is provided with a roller 77 riding against the outer face of a cam 78 upon the shaft 43. This cam and lever link connectiontends to move the pushers 65 to upper inoperative position and the body frame 14 of the-press and at the other end to the pivot pi-n 82 connecting the link 7 3 with link 74 actuates the nushers in their pushing action. 1

tion of'the pushers unless the blank is accurately supported at its two ends. At the inner front corners of the two outermost bearings 25 and 27 are provided slide rods 83 and 84 sliding in bearings 85"and the" pushers are arranged between and closely ad acent these two outside heads. A lever or arm 86 is pivoted on each bearing 25 and 27 and in position to normally lie behind a block 87 on the rod 66of the pusher. On each slide rod 33 and 84 isprovided a collar 88. The slide rod is normally disposed so that its front end protrudes beyond the adjacent suction head and when a blank is moved by the suction heads the rod is slid rearwardly. The arrangement of the collar is such that it en gas the lever and moves, it from the pat of the collar. If there be no blank resent the levers remain in position behin the blocks 97 and pre-v vent action of the ushers, and these-me is true if either of the endm'o'st suction heads fail to be engaged with the blank in the blank moving action. Where either or both levers 86 are restraining the action ofthe pushers the spring 79 fails to move the pushers as will be readily understood.

When. however, the pushers are moved they engage the upper edge of the blank and to this end a hardened steel member 89 is provided in the forward under edge of each pusher to engage over the blank and move it edgewise downwardly.

Viewing Fig. 9 it will be noted that the material of the support 28 is cut away at 91 to provide a bevelled entrance to the slot and the plate 92 forming the back of the slot is bevelled slightly at its upper edge 93 to prevent scarring the tin of the blank in the movement inserting it into the slot.

Mechanism, as has been already stated. is provided for preventing feeding of the blanks should more than one of them be positioned in the slot at the same time. While the mechanism for advancing the blank along the slot and between the dies is not believed to require particular descrip tion, it perhaps should be mentioned that a crank disk 94 is provided upon the end of; the main power shaft and this disk is connected by a connectin rod 95'with a bell crank lever 96 pivote at 97 in the frame 1 of the machine and engaging a link 98 which acts to advance the blanks along the slot. The connection between the link 98 andthe bell crank lever 96 is perhaps best seen in Figs. 2 and 5 from which it will be noted that the end of the link connected with the bell crank isprovided with a head 99 having an arcuate recess llll in its side. This forms one of two jaws, tlieother of which is composed of a member 102 pivoted at 103 on the side ofthe arm and having a companion recess 104 adapted ,with the recess 101 to embrace the pivot pin connecting it wit-lithe bell crank. A bolt 105 is screwed at one end intothj'ei he ad 99 and extends throu h the member 102." This bolt is'em braced the jaws in driving engagement about the pin. The arrangement, h'oweirer,=" rmitsdisconnection when resistance is o ered. to the pull of the link in the advancing action. Referring now to Fig. 8, it will be noted that the material of the plate 93 is provided with an aperture 107 and in this aperl blank by the suction "head. by a spring 106 which normally holds ture ismounted a spring pressed block 108 normally extending across the slot; This block has a stem 109 having a sliding bearing in a screw block 111 mounted in" the end of a bore 112 immediately back of and in registration with the aperture 107. A spring 113 embraces the stem 109 of the block 108 and holds it normally extending across the recess. The forward end of the block is rounded and it two or more sheets are forced into the slot the block is pushed back so that itdoes not extend beyond the plane of the rear slot wall. A hook lever 114 pivoted at 115 on an arm 116 extendin out from left-hand bearing 72 is provided at its right-hand end (viewing Fig. 8) with a set screw 117 adapted for engagement with the end of the block stem 109. When a single sheet is inserted in the slot the movement of the block is insufiic-ient to cause it to engage with the set screw 117 but when two sheets are inserted engagement results and the hook lever is moved in a counterclockwise direction and againsta spring 118 provided to all it in the reversedirection. The hook ever engages beneath one arm 119 of a three arm lever pivoted at 121 on an arm 122 of the left-hand bearing 72. Another arm 123 of this three-arm lever is connected by a link 124 with an arm-125 pivoted at 126 on the end of the stack holder support 28. The arm 125.. is normally disposed out of the path of movement of the pivotal connection 127 between the drivi link 98 and the blank advancing slide 128. This feed bar has retractable fingers 130 that successively engage behind the blank to advance it.

When, however, the hook lever is released I a spring 129 engaging an arm 131 of the left-hand bracket 72 and the third arm 132 pulls the arm 125 path of travel of the coupling I of thethree arm lever over into the 127 and causes the link 98 to disen from the bell crank 96 with the resulting stoppage of the feed. This action is two blanks have thus stoppedv the feeding, the lever 133 rests out of the way'by reason of the fact that the end having a set screw 129 is heavier than the end 136 and the lever is moved by gravity out of position for en gagement with the rod 83. 1

Means are also provided to .prevent the [feeding action of the articles, as for example accom- 3 pamed by lnterruption of the actlon oi the 120' I sition and-preventing-any engagement of a 1 Except when and the like,

and 84 move down again into a position permitting the levels to drop in bep can ends, accumulate in too great amount in the chute 141 leading from the dies, and this means comprises a lever pivoted at 142 and having one arm 143 bent out and curved (indicated in Fig. 4). and adapted tobe lifted if the formed articles pile too high in the chute. The other arm 14A of this lever extends over above the rod ea mounted in the bearing for the right-hand suction head rod. vWhen the arm 14A prevented frombringing a blank to the slot and the lever 86 is not raised to permit action of the pushers. -After the pushers have pushed" a blank intoposition the rods dvanced hind the pushers. The !forward adjacent edges of the pushers arebevelled atl45 as is also referably the rlght corner of the blocks 87 at 146 to permit the [ends of the.

levers to be lifted upon the returnmovement of the pushers. i It is thought that the invention and many ofits attendant advantages will be understood from the foregoing descriptiomand it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of'the Invention on sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof. I

Claims: 1

1. In a feeding mechanism for die presses the combination of a stack holder, sheet-holding means for sheets taken from said stack holder, having a slot adaptblanles pile up'and the is moved down the suction head is p wearer ed to hold a plurality of sheets and extend ing downward below said stack holder, means for removing sheets from the stack holder: to a point over said slot said sheets pass upon release from said removing means, a transverse pin extending into said slot, and engageable by a sheet therein, a feeding slide for propelling sheets successively'out of said slot to be operated on by said press, andmeans where y "said in controls 'theoperation of the feeding slide" and the operation of said removing means. a

2. In a feeding mechanism for-die presses and the like,'the combination of a feed way, feedin means for advancing blanks deosite insaid feed way, and means projectable-in the path of said feeding means when more than a single'blank is deposited in said feed way. i f

3. In a feeding mechanism for, die presses and the like, the combination ofla feed way, means for feeding blanks along said feed way, and means releasable through the presence of more than a single blank 1n said feed- Way and priectable across the path of travel of said feeding means.

.4. In a feeding mechanism for die presses and the like, the-combination of a feed way,

a member normally disposed in said feed way and movable by a blank and in amount determined by the thickness of the blanks, feeding mechanism for feeding blankn along said feed way and a lock for said feeding ,slot into which mechanism, releasable by movement of said member and in amount greater than the thickness of =the blank.

HUGU SCHOENDELEN. 

